I just got my GT-40 lower back from Tom, who did an excellent job of porting it. I know there's not a ton to port on the GT-40's, but hey, every little bit helps. Tom work looks first rate, and he got it back to me quickly! Sorry, I don't have any pics for now. As soon as I get my heads and cam from Ed C I will post some dyno #'s. Just wanted to give Tom some props for the good work he does.